Мой ответ::::::::::::
1)-2;10
7)-23;1
1. <span>2xy² - 18х = </span> 2х(<span>y² - 9) = </span> 2х(y - 3)(y + 3)
2. <span>(b-1)²(b+2) - b²(b-3) + 3</span> = (<span>b² - 2</span><span>b + 1)</span>(b+2) - <span>b³ + 3</span>b² + 3 =
= <u /><span><u>b³ +</u> 2</span>b² - 2<span>b² - 4</span>b + <span>b + 2<u /></span><u> - b³</u> + 3b² + 3 =
= - 4b + <span>b + 2</span> + 3b² + 3 = 3b² + 5<span>b + 5</span>
Log0,5 (x^2-3x)=-2
ОДЗ: x^2-3x>0 или
x<0 и x>3
x^2-3x = 0,5^(-2)
x^2-3x -4 = 0
x1 = 4
x = -1
log2 Vх -log2 1/x =3
ОДЗ: x>0
log2 {Vx\(1\x)} = 3
xVx = 2^3
(x^(3\2))^2 = 2^6
x^3 = 2^6
<span>x = 2^2 = 4</span>